Affiliation:
1. The University of Iowa Iowa City
Abstract
In order to examine the basis of familial associations with poor language achievement, 62 twinship pairs and 3 sets of triplets were studied in which at least one member presented poor oral language status in the absence of other developmental or sensory impairments. Rates of concordance for poor language were compared between the monozygotic (MZ) and dizygotic (DZ) pairs. Concordance for the MZ pairs was .96, whereas it was .69 for the DZ pairs. The DeFries-Fulker method for computing heritability of extreme scores was employed yielding a h
2
g
of .45. Similar results were obtained for those pairs containing only children with performance IQs above 85, but with at least one member having language below –1
SD
. A comparison of DZ twins with singleton sibling pairs with at least one affected member and of similar age showed that DZ twins were more similar with respect to language achievement than singleton pairs. Thus, twinning appeared to have influenced twin resemblance among those where at least one member presented poor language achievement. These results support the hypothesis that genetic factors contribute to the liability of poor language achievement in children who do not present other developmental or sensory disorders.
Publisher
American Speech Language Hearing Association
Subject
Speech and Hearing,Linguistics and Language,Language and Linguistics
Reference53 articles.
1. Measures of twin concordance;Allen G.;Acta Genetica,1967
2. Reading disability in twins;Bakwin H.;Developmental Medicine and Child Neurology,1973
3. Familial transmission of speech and language impairment: A preliminary investigation;Beitchman J. H.;Canadian Journal of Psychiatry—Revue Canadienne De Psychiatrie,1992
4. Is specific language impairment a valid diagnostic category?;Bishop D. V. M.;Genetic and psycholinguistic evidence. Philosophical Transactions of the Royal Society of London,1994
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